Author Topic: Mass loaded vinyl around IC-rated can light  (Read 1837 times)


  • Guest
Mass loaded vinyl around IC-rated can light
« on: March 21, 2019, 07:29:30 PM »
As part of some renovations in my basement, I am trying to attenuate noise coming from the level above. Thanks to this forum, we now are planning to use resilient channels (to reduce footfall noise) and rockwool insulation (to reduce voices).

Due to an extremely low ceiling, we cannot avoid using recessed lights. This forum recommended surrounding the lights in a sheetrock box, which is cost prohibitive. Far easier to build, though, would be flexible 'boxes' made out of 2 lb/sq ft MLV. I am imagining taping five pieces of MLV together with gaffer's tape, leaving one of the five sides as a "flap", sliding the whole thing around the light, then taping down the last side. I would seal the assembly around the bottom of the can with more gaffer's tape.

My electrician has assured me that this would not violate code, so the real question is efficacy. Is there any reason to believe it would not be effective? It adds 5-10 lbs of mass to each light, and the tape seals off any air gaps around the assembly.

Also, given that we are making all these holes in the drywall, would we expect to get any benefit from using QuietRock or other elastomer-enhanced drywall?

Randy S

  • Guest
Re: Mass loaded vinyl around IC-rated can light
« Reply #1 on: March 22, 2019, 03:09:56 PM »
The mass loaded vinyl is UL94 not class A fire rated (E84) normally I use double layers of drywall.
If your electrician insures you wont have a problem then as long as it is sealed properly it will work.

for your second question , mass is mass and the more of it the better the results.

Randy S.